EP2469724A1 - Precoding method and device - Google Patents
Precoding method and device Download PDFInfo
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- EP2469724A1 EP2469724A1 EP09848379A EP09848379A EP2469724A1 EP 2469724 A1 EP2469724 A1 EP 2469724A1 EP 09848379 A EP09848379 A EP 09848379A EP 09848379 A EP09848379 A EP 09848379A EP 2469724 A1 EP2469724 A1 EP 2469724A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/022—Site diversity; Macro-diversity
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/0413—MIMO systems
- H04B7/0452—Multi-user MIMO systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/0413—MIMO systems
- H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
- H04B7/0478—Special codebook structures directed to feedback optimisation
Definitions
- the present invention relates to a pre-coding method and apparatus.
- the present invention relates to a pre-coding method and apparatus in a multi-user macro-diversity transmission system.
- a plurality of base stations perform multi-input multi-output (MIMO) transmission with respect to a same mobile station.
- MIMO multi-input multi-output
- Each base station independently performs adaptive pre-coding.
- a plurality of base stations transmit same information to a mobile station. In other words, data services for the mobile station are duplicated in all coordination-related base stations.
- the existing pre-coding methods adopted in a multi-user macro-diversity transmission system have certain limitation. Therefore, it is desirable for a new pre-coding solution that may further utilize a potential macro-diversity gain while guaranteeing that a user correctly receiving his/her own data stream in a multi-user composite channel.
- the present invention aims to provide an enhanced pre-coding solution for a multi-user macro-diversity transmission.
- a pre-coding method in a multi-user macro-diversity transmission system comprises: obtaining, for a mobile station in the multi-user macro-diversity transmission system, a first sub-precoder that guarantees orthogonality between equivalent channels of users; obtaining a second sub-precoder by performing QR decomposition based on equivalent channels precoded through the first sub-precoder; obtaining a final pre-coder with respect to the mobile station by combining the first sub-precoder and the second sub-precoder; and performing pre-coding on data of the mobile station with the final precoder.
- a base station in a multi-user macro-diversity transmission system comprises a pre-coding module for performing pre-coding with respect to data of respective users.
- the pre-coding module comprises: a first sub-precoding means configured to obtain, for a mobile station in the multi-user macro-diversity transmission system, a first sub-precoder that guarantees orthogonality between equivalent channels of users; a second sub-precoding means configured to obtain a second sub-precoder by performing QR decomposition based on equivalent channels precoded through the first sub-precoder.
- the pre-coding module combines the first sub-precoder and the second sub-precoder to obtain a final pre-coder with respect to the mobile station, and performs pre-coding on data of the mobile station with the final precoder.
- a multi-user macro-diversity transmission system comprising: a plurality of mobile stations and a plurality of base stations according to the present invention, wherein macro-diversity data transmission is performed between the plurality of mobile stations and the plurality of base stations.
- the technical solution according to the present invention enables a plurality of macro-diversity data transmission with respect to the particular mobile station to be substantively in the same direction, such that at the particular mobile station, an enhanced macro-diversity gain may be obtained through combining in the same direction, particularly in the case that each user has a plurality of data streams. Moreover, according to the present invention, even if no additional cooperative coordination is performed between a plurality of involved base stations, the enhanced macro-diversity gain may also be obtained. Therefore, a higher macro-diversity gain may be achieved in a system implementation without increasing signaling load as long as all base stations are enabled to execute the pre-coding solution according to the present invention.
- Fig. 1 is an example of coordinated pre-coding in a multi-user macro-diversity transmission system.
- Fig. 2 schematically illustrates a flow chart of performing pre-coding in a base station of a multi-user macro-diversity transmission system according to an embodiment of the present invention
- Fig. 4 is a simulation diagram of comparing performances between pre-coding performed according to an embodiment of the present invention and traditional pre-coding.
- Embodiments of the present invention provide an enhanced pre-coding solution for macro-diversity transmission.
- macro-diversity gain of a multi-user macro-diversity transmission system may be improved through the improved pre-coding solution.
- a basic idea of the present invention lies in that by adopting the pre-coding solution according to the present invention at base stations in a multi-user macro-diversity transmission system, equivalent channels from the base stations to each of a plurality of mobile stations in the multi-user macro-diversity transmission system are substantially orthogonal with respect to the equivalent channels of other mobile stations, so as to mitigate series interference between users; and the signals transmitted from a plurality of base stations with respect to a same mobile station are substantially in a same direction, so as to obtain a considerable macro gain at the mobile station.
- Fig. 2 schematically illustrates a flow chart of performing pre-coding in a base station of a multi-user macro-diversity transmission system according to an embodiment of the present invention.
- step S200 the pre-coding process starts.
- a first sub-precoder that guarantees orthogonality between equivalent channels of users is obtained for users in a multi-user macro-diversity transmission system, for example, a mobile station i.
- the first sub-precoder for each mobile station resides in a nulling space of a composite channel formed by channels of other users.
- pcH ki is an SxNt matrix (or vector), wherein S denotes the number of data streams to be transmitted to the mobile station i, and Nt denotes the number of transmit antennas at the base station.
- V denotes a right singular matrix, which forms the direction of a standard orthogonal input basic vector of the matrix cpsH i
- U denotes a left singular matrix, which forms the direction of a standard orthogonal output basic vector of the matrix cpsH i
- S denotes a diagonal matrix including singlular values of the composite channel cpsH i .
- the singular values are ordered from left to
- Equation 3 denotes extracting the last Nt-(M-1)*S columns of the right singular matrix V as the i nulling space generation vector of cpsH i , i.e., the first sub-precoder.
- the first sub-precoder may also be obtained through any known algorithm in the prior art. For example, those skiled in the art may also obtain the nulling first pre-coder matrix through performing a characteristic value decomposition-based block diagonization approach, i.e., performing characteristic value decomposition on the matrix resulted by multiplying conjugate transpose of cpsH i by the matrix cpsH i , or obtain the nulling first sub-precoder matrix through a zero-forcing approach.
- a characteristic value decomposition-based block diagonization approach i.e., performing characteristic value decomposition on the matrix resulted by multiplying conjugate transpose of cpsH i by the matrix cpsH i , or obtain the nulling first sub-precoder matrix through a zero-forcing approach.
- QR decomposition is performed based on the equivalent channels pre-coded through the first sub-precoder, namely, combining the physical channel and nulling space generation orthogonal vector (it is W null in this embodiment), thereby obtaining a second sub-precoder.
- cbH i H QR
- H denotes the conjugate transpose of the matrix
- Q denotes the unitary matrix of (Nt-(M-1)*S) ⁇ S
- R denotes the upper triangular matrix of S ⁇ S.
- the diagonal elements of the pre-coded final equivalent channel matrix may be modified to be positive integer utilizing the QR decomposition.
- the equivalent channel matrixes of a plurality of base stations in the multi-user macro-diversity transmission system with respect to a particular mobile station are modified to be integers with diagonal elements, a plurality of macro-diversity data with respect to the particular mobile station may be transmitted in substantial same direction, such that an enhancedmacro-diversity gain may be obtained through combining in the same direction.
- step S250 the pre-coding process ends.
- the above pre-coding process is performed for each user (mobile station 1 - mobile station M) in each base station.
- Fig. 3 schematically illustrates a block diagram of functions of a base station of a multi-user macro-diversity transmission system according to an embodiment of the present invention.
- reference numeral 300 denotes a base station in the multi-user macro diversity transmission system
- reference numeral 310 denotes a multi-input multi-output coder
- reference numeral 320 denotes a pre-coding module for pre-coding data of each user
- reference numeral 330 denotes a plurality of transmit antennas of the base station.
- the second sub-precoding means 322 is used for obtaining a second pre-coder by performing QR decomposition to the equivalent channels pre-coded through the fist sub-precoder obtained by the first pre-coding means 321, wherein the second sub-precoder modifies diagonal elements of a pre-encoded final equivalent channel matrix to be positive integer.
- the embodiments of the present invention at least have the following advantage: more macro-diversity gainmaybe achieved for the multi-user macro-diversity transmission system, particularly in the case that each user has a plurality of data streams.
- the performance of multi-user macro-diversity transmission may be greatly enhanced.
- another advantage lies in that even if no additional cooperative coordination is performed between a plurality of involved base stations, the enhanced macro-diversity gain may also be obtained.
- an advantage of higher macro-diversity gain may be achieved in system implementation without increasing signaling load, as long as all the base stations are subjected to the Pre-coding solution of the present invention.
- Fig. 4 is a simulation diagram of comparing performances between pre-coding performed according to an embodiment of the present invention and traditional pre-coding.
- Table 1 Number of cells and number of transmit antennas 2 base stations, each with 4 transmit antennas Number of mobile stations and number of receive antennas 2 mobile stations with 2 receive antennas. Number of data streams per MS 2 Path loss and shadow fading large-scale fading is assumed to be the same in multiple cells
- Channel model Independent Rayleigh channel Bandwidth One subcarrier assumed Feedback transmission Ideal Channel estimation Ideal Signal power and noise power Sum transmission power per UE (minus the large scale attenuation) is assumed to be two times the noise power at the receiver
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Abstract
Description
- The present invention relates to a pre-coding method and apparatus. In particular, the present invention relates to a pre-coding method and apparatus in a multi-user macro-diversity transmission system.
- In a multi-user macro-diversity transmission system, a plurality of base stations perform multi-input multi-output (MIMO) transmission with respect to a same mobile station. Each base station independently performs adaptive pre-coding. A plurality of base stations transmit same information to a mobile station. In other words, data services for the mobile station are duplicated in all coordination-related base stations.
- When a plurality of base stations perform the above multi-input multi-output transmission with respect to multiple users in a plurality of different cells, it is needed to perform coordinated pre-coding.
Fig. 1 is an example of coordinated pre-coding in a multi-user macro-diversity transmission system. During the coordinated pre-coding process,base station 1 andbase station 2 independently perform single-base station multi-user adaptive pre-coding with respect to a plurality of mobile stations such asmobile station 1 andmobile station 2, wherein eachmobile station has a stream. For example,base station 1 duplicates data (x1, x2, x3, ...) with respect tomobile station 1 and data (y1, y2, y3, ...) with respect tomobile station 2 from the core network, performs multi-input and multi-output coding and pre-coding with respect to the above data, respectively, and transmits the corresponding data stream to themobile station 1 andmobile station 2 through a plurality of transmit antennas, respectively. Likewise,base station 2 performs a similar operation tobase station 1 and transmits the pre-encoded data stream tomobile station 1 andmobile station 2, respectively. - As far as the performance is concerned, a best existing solution ofmulti-user pre-codingin a multi-user macro-diversity transmission system is a so-called "dirty paper coding," which solution is based on a multi-user composite channel (i.e., so-calledglobal channel). However, highcomplexityofdirtypaper coding is rather difficult in implementation.
- As far as the implementation feasibility is concerned, a best existing solution of multi-user pre-coding in a multi-user macro-diversity transmission system is local Block Diagonization pre-coding, wherein the pre-coding is implemented by performing singular value decomposition to the multi-user channel. However, this solution has a drawback that it is difficult for the user to obtain enough macro-diversity gain.
- Accordingly, the existing pre-coding methods adopted in a multi-user macro-diversity transmission system have certain limitation. Therefore, it is desirable for a new pre-coding solution that may further utilize a potential macro-diversity gain while guaranteeing that a user correctly receiving his/her own data stream in a multi-user composite channel.
- The present invention aims to provide an enhanced pre-coding solution for a multi-user macro-diversity transmission.
- According to a first aspect of the present invention, there is provided a pre-coding method in a multi-user macro-diversity transmission system. The method comprises: obtaining, for a mobile station in the multi-user macro-diversity transmission system, a first sub-precoder that guarantees orthogonality between equivalent channels of users; obtaining a second sub-precoder by performing QR decomposition based on equivalent channels precoded through the first sub-precoder; obtaining a final pre-coder with respect to the mobile station by combining the first sub-precoder and the second sub-precoder; and performing pre-coding on data of the mobile station with the final precoder.
- According to a second aspect of the present invention, there is provided a base station in a multi-user macro-diversity transmission system. The base station comprises a pre-coding module for performing pre-coding with respect to data of respective users. The pre-coding module comprises: a first sub-precoding means configured to obtain, for a mobile station in the multi-user macro-diversity transmission system, a first sub-precoder that guarantees orthogonality between equivalent channels of users; a second sub-precoding means configured to obtain a second sub-precoder by performing QR decomposition based on equivalent channels precoded through the first sub-precoder. The pre-coding module combines the first sub-precoder and the second sub-precoder to obtain a final pre-coder with respect to the mobile station, and performs pre-coding on data of the mobile station with the final precoder.
- According to a third aspect of the present invention, there is provided a multi-user macro-diversity transmission system. The system comprises: a plurality of mobile stations and a plurality of base stations according to the present invention, wherein macro-diversity data transmission is performed between the plurality of mobile stations and the plurality of base stations.
- The technical solution according to the present invention enables a plurality of macro-diversity data transmission with respect to the particular mobile station to be substantively in the same direction, such that at the particular mobile station, an enhanced macro-diversity gain may be obtained through combining in the same direction, particularly in the case that each user has a plurality of data streams. Moreover, according to the present invention, even if no additional cooperative coordination is performed between a plurality of involved base stations, the enhanced macro-diversity gain may also be obtained. Therefore, a higher macro-diversity gain may be achieved in a system implementation without increasing signaling load as long as all base stations are enabled to execute the pre-coding solution according to the present invention.
- Other objectives and effects of the present invention will become much clearer and easier to understand through the following description with reference to the accompanying drawings and with more comprehensible understanding of the present invention, wherein:
-
Fig. 1 is an example of coordinated pre-coding in a multi-user macro-diversity transmission system. -
Fig. 2 schematically illustrates a flow chart of performing pre-coding in a base station of a multi-user macro-diversity transmission system according to an embodiment of the present invention; -
Fig. 3 schematically illustrates a block diagram of functions of a base station of a multi-user macro-diversity transmission system according to an embodiment of the present invention; -
Fig. 4 is a simulation diagram of comparing performances between pre-coding performed according to an embodiment of the present invention and traditional pre-coding. - In all of the above accompanying drawings, like reference numbers indicate same, like or corresponding features or functions.
- Embodiments of the present invention provide an enhanced pre-coding solution for macro-diversity transmission. Through using the technical solution according to the present invention, macro-diversity gain of a multi-user macro-diversity transmission system may be improved through the improved pre-coding solution.
- A basic idea of the present invention lies in that by adopting the pre-coding solution according to the present invention at base stations in a multi-user macro-diversity transmission system, equivalent channels from the base stations to each of a plurality of mobile stations in the multi-user macro-diversity transmission system are substantially orthogonal with respect to the equivalent channels of other mobile stations, so as to mitigate series interference between users; and the signals transmitted from a plurality of base stations with respect to a same mobile station are substantially in a same direction, so as to obtain a considerable macro gain at the mobile station.
- According to the technical solution of the present invention, when performing downlink data transmission, in order to transmit data from a core network to mobile stations as users, a cell will perform local multi-user pre-coding, and the pre-coding process is performed with respect to each user of each base station.
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Fig. 2 schematically illustrates a flow chart of performing pre-coding in a base station of a multi-user macro-diversity transmission system according to an embodiment of the present invention. - At step S200, the pre-coding process starts.
- At step S210, a first sub-precoder that guarantees orthogonality between equivalent channels of users is obtained for users in a multi-user macro-diversity transmission system, for example, a mobile station i.
- Specifically, the first sub-precoder for each mobile station resides in a nulling space of a composite channel formed by channels of other users.
- Suppose each mobile station in the plurality of mobile stations feeds back an equivalent channel matrix (or vector) pcHki (wherein, i=1, 2, ..., M, i denotes an index of a mobile station) to its serving cell k. pcHki is an SxNt matrix (or vector), wherein S denotes the number of data streams to be transmitted to the mobile station i, and Nt denotes the number of transmit antennas at the base station.
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- According to an exemplary embodiment of the present invention, in order to obtain the first sub-precoder, the composite channel may be subjected to singular value decomposition, which is expressed as:
wherein V denotes a right singular matrix, which forms the direction of a standard orthogonal input basic vector of the matrix cpsHi; U denotes a left singular matrix, which forms the direction of a standard orthogonal output basic vector of the matrix cpsHi; while S denotes a diagonal matrix including singlular values of the composite channel cpsHi. Here, it is supposed that the singular values are ordered from left to right in a non-ascending order. -
- Equation 3) denotes extracting the last Nt-(M-1)*S columns of the right singular matrix V as the i nulling space generation vector of cpsHi, i.e., the first sub-precoder.
- Accordingly, through performing the above steps, a first sub-precoder Wnull that guarantees orthogonality between equivalent channels of users may be obtained.
- It should be noted that the above described exemplary process of obtaining the first sub-precoder substantially exploits the so-called singular value decomposition-based block diagonization approach. The first sub-precoder may also be obtained through any known algorithm in the prior art. For example, those skiled in the art may also obtain the nulling first pre-coder matrix through performing a characteristic value decomposition-based block diagonization approach, i.e., performing characteristic value decomposition on the matrix resulted by multiplying conjugate transpose of cpsHi by the matrix cpsHi, or obtain the nulling first sub-precoder matrix through a zero-forcing approach.
- At step S220, QR decomposition is performed based on the equivalent channels pre-coded through the first sub-precoder, namely, combining the physical channel and nulling space generation orthogonal vector (it is Wnull in this embodiment), thereby obtaining a second sub-precoder.
-
-
- The QR decomposition may be actually calculated with various algorithms, for example, Givens rotation, Householder transformation, and Gram-Schmidt orthogonalization, etc. How to specifically calculate the QR decomposition does not constitute any limitation to the present invention, and thus the depiction of QR decomposition calculation is omitted here.
- The second sub-precoder W2 is determined based on the QR decomposition performed to the combined channel cbHi:
wherein, the function of DiagSign ( . ) outputs a diagonal matrix with diagonal elements +1 or -1, while the positive or negative signs of the diagonal elements depend on the diagonal elements of its input matrix. Specifically, for equation 6), the diagonal elements in the diagonal matrix outputted by DiagSign (R) depend on the positive or negative of the diagonal elements of the matrix R to correspondingly take +1 or -1. - Through the second sub-precoder, the diagonal elements of the pre-coded final equivalent channel matrix may be modified to be positive integer utilizing the QR decomposition. When the equivalent channel matrixes of a plurality of base stations in the multi-user macro-diversity transmission system with respect to a particular mobile station are modified to be integers with diagonal elements, a plurality of macro-diversity data with respect to the particular mobile station may be transmitted in substantial same direction, such that an enhancedmacro-diversity gain may be obtained through combining in the same direction.
-
- At step S240, pre-coding is performed to data of the corresponding mobile station i utilizing the final pre-coder.
- At step S250, the pre-coding process ends.
- In the multi-user macro diversity transmission system, the above pre-coding process is performed for each user (mobile station 1 - mobile station M) in each base station.
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Fig. 3 schematically illustrates a block diagram of functions of a base station of a multi-user macro-diversity transmission system according to an embodiment of the present invention. In this embodiment,reference numeral 300 denotes a base station in the multi-user macro diversity transmission system;reference numeral 310 denotes a multi-input multi-output coder;reference numeral 320 denotes a pre-coding module for pre-coding data of each user; andreference numeral 330 denotes a plurality of transmit antennas of the base station. - As illustrated in
Fig. 3 , thepre-coding module 320 performs pre-coding on data of each user. According to the embodiment of the present invention, thepre-coding module 320 comprises a first sub-precoding means 321 and asecond sub-precodingmeans 322; a final pre-coder for each mobile station is obtained by concatenating the first and second sub-precoding means and combining the first and second pre-coder. - The first sub-precoding means 321 is for obtaining a first pre-coder that guarantees the orthogonality between equivalent channels of users. For example, a nulling space generation vector of a composite channel formed by the mobile station i with respect to other mobile stations (users) may be obtained by performing singular value decomposition to the composite channel, as the first sub-precoder.
- The second sub-precoding means 322 is used for obtaining a second pre-coder by performing QR decomposition to the equivalent channels pre-coded through the fist sub-precoder obtained by the first pre-coding means 321, wherein the second sub-precoder modifies diagonal elements of a pre-encoded final equivalent channel matrix to be positive integer.
- The
pre-coding module 320 combines the first and second pre-coders provided by the first pre-coding means 321 and the second pre-coding means 322, respectively, thereby obtaining a final pre-coder for each mobile station. Thepre-coding module 320 performs pre-coding to data of eachmobile station by utilizing the final pre-coder. - It should be noted that in the
pre-coding module 320, it is needed to determine a final pre-coder for eachmobile station, and then perform pre-coding to data of each mobile station utilizing the final pre-coder. - Those skilled in the art would appreciate that in the calculation of determining a pre-coder through the first pre-coding means 321 and the second pre-coding means 322 in the
Pre-coding module 320, it is needed to provide feedback physical channel information between each mobile station and thebase station 300 through for example channel estimation (not shown inFig. 3 ). However, in order to better embody the focus of the present invention, some known technical details (such as feedback channel, channel estimation module, etc.) in the art are not depicted inFig. 3 . Those skilled in the art may use corresponding functional modules on the basis of the block diagrams of the functions of thebase station 300 ofFig. 3 , so as to implement the entire function in the base station. - Besides, those skilled in the art would appreciate that the pre-codingmodule 320 maybe implemented in any suitable manner in the art, for example, implemented as hardware, or implemented asa computer program instruction of a firmware or software. In this embodiment, the hardware may be a dedicated circuit, for example, an application-specific integrated circuit (ASIC), or a programmable circuit, for example, a digital signal processor (DSP) and a field programmable gate array (FPGA), etc.
- The embodiments of the present invention at least have the following advantage: more macro-diversity gainmaybe achieved for the multi-user macro-diversity transmission system, particularly in the case that each user has a plurality of data streams. In this way, the performance of multi-user macro-diversity transmission may be greatly enhanced. Moreover, according to the technical solution of the present invention, another advantage lies in that even if no additional cooperative coordination is performed between a plurality of involved base stations, the enhanced macro-diversity gain may also be obtained. Thus, according to the technical solution of the present invention, an advantage of higher macro-diversity gain may be achieved in system implementation without increasing signaling load, as long as all the base stations are subjected to the Pre-coding solution of the present invention.
-
Fig. 4 is a simulation diagram of comparing performances between pre-coding performed according to an embodiment of the present invention and traditional pre-coding. - Simulation conditions are specified in Table 1.
Table 1 Number of cells and number of transmit antennas 2 base stations, each with 4 transmit antennas Number of mobile stations and number of receive antennas 2 mobile stations with 2 receive antennas. Number of data streams per MS 2 Path loss and shadow fading large-scale fading is assumed to be the same in multiple cells Channel model Independent Rayleigh channel Bandwidth One subcarrier assumed Feedback transmission Ideal Channel estimation Ideal Signal power and noise power Sum transmission power per UE (minus the large scale attenuation) is assumed to be two times the noise power at the receiver - From the simulation results, it may be seen that the performance of the pre-coding method in a multi-user macro-diversity system is apparently better than the traditional method, whose capacity is enhanced by about 1bps/Hz.
- The purpose for providing the description of the present invention is to explain and describe, not to exhaust or limit the present invention within the disclosed form.To a person of normal skill in the art, various modifications and alternations are obvious. The skilled in the art may further understand, the method and apparatus in the embodiments of the present invention may be implemented through software, hardware, firmware, or their combination.
- Thus, selecting and describing the preferred embodiments is to better illustrate the principle and practical application of the present invention and to enable a person of normal skill in the art to appreciate that without departing the spirit of the present invention, all modifications and alterations fall within the protection scope of the present invention as limited by the appending claims.
Claims (13)
- A pre-coding method in a multi-user macro-diversity transmission system, comprising:obtaining , for a mobile station in the multi-user macro-diversity transmission system, a first sub-precoder that guarantees orthogonality between equivalent channels of users;obtaining a second sub-precoder by performing QR decomposition based on equivalent channels precoded through the first sub-precoder;obtaining a final pre-coder with respect to the mobile station by combining the first sub-precoder and the second sub-precoder; andperforming pre-coding on data of the mobile station with the final precoder.
- The method according to claim 1, wherein in the multi-user macro-diversity transmission system, the pre-coding method is performed at each base station for each mobile station.
- The method according to claim 1, wherein the second sub-precoder modifies diagonal elements of a precoded final equivalent channel matrix to be positive integer.
- The method according to claim 3, wherein the equivalent channel precoded through the first sub-preocder is cbHi, and a QR decomposition mav be expressed as:
wherein, i denotes an index of a mobile station in the multi-user macro-diversity transmission system, H denotes a conjugate transpose of the matrix, Q denotes a unitary matrix of (Nt-(M-1)*S)×S; R denotes an upper triangular matrix of S×S, where M denotes the number of mobile stations in the multi-user macro-diversity transmission system; Nt denotes the number of transmit antennas at the base station, and S denotes the number of data streams transmitted for the mobile station; and wherein the second sub-precoder is determined as:
wherein, the function of DiagSign (•) outputs a diagonal matrix with diagonal elements +1 or -1, while the positive or negative symbols of the diagonal elements depend on the diagonal elements of its input matrix. - The method according to claim 1, wherein the first pre-coder of the mobile station resides in a nulling space of a composite channel formed by other users in the multi-user macro-diversity transmission system.
- The method according to claim 5, wherein a first pre-coder is obtained through an algorithm from a group at least comprising the following algorithms:a block diagonalization based on singular value decomposition or a characteristic value decomposition; and zero-forcing.
- A base station in a multi-user macro-diversity transmission system, comprising a pre-coding module for pre-coding data of each user, the pre-coding module comprising:first sub-precoding means configured to obtain, for a mobile station in the multi-user macro-diversity transmission system,a first sub-precoder that guarantees orthogonality between equivalent channels of users;second pre-coder means configured to obtain a second sub-precoder by performing QR decomposition based on equivalent channels precoded through the first sub-precoder;wherein the pre-coding module combines the first sub-precoder and the second sub-precoder to obtain a final pre-coder with respect to the mobile station, and performs pre-coding on data of the mobile station with the final precoder.
- The base station according to claim 7, wherein the Pre-coding module is configured to perform a pre-coding process for each mobile station in the multi-user macro-diversity transmission system.
- The base station according to claim 7, wherein the second sub-precoder means modifies diagonal elements of a precoded final equivalent channel matrix to be positive integer.
- The base station according to claim 9, wherein the equivalent channel precoded through the first sub-preocder is cbHi, and a QR decomposition may be expressed as:
wherein, i denotes an index of a mobile station in the multi-user macro-diversity transmission system, H denotes a conjugate transpose of the matrix, Q denotes a unitary matrix of (Nt-(M-1)*S)×S; R denotes an upper triangular matrix of S×S, where M denotes the number of mobile stations in the multi-user macro-diversity transmission system; Nt denotes the number of transmit antennas at the base station, and S denotes the number of data streams transmitted for the mobile station; and wherein the second sub-precoder is determined as:
wherein, the function of DiagSign (•) outputs a diagonal matrix with diagonal elements +1 or -1, while the positive or negative symbols of the diagonal elements depend on the diagonal elements of its input matrix. - The base station according to claim 7, wherein the first pre-coder of the mobile station resides in a nulling space of a composite channel formed by other users in the multi-user macro-diversity transmission system.
- The base station according to claim 11, wherein a first pre-coder is obtained through an algorithm from a group at least comprising the following algorithms:a block diagonalization based on singular value decomposition or a characteristic value decomposition; andzero-forcing.
- A multi-user macro-diversity transmission system, comprising:a plurality of mobile stations; anda plurality of base stations according to any one of claims 7-12;wherein macro-diversity data transmission is performed between the plurality of mobile stations and the plurality of base stations.
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PCT/CN2009/073315 WO2011020238A1 (en) | 2009-08-18 | 2009-08-18 | Precoding method and device |
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EP (1) | EP2469724B1 (en) |
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KR101382760B1 (en) * | 2007-03-21 | 2014-04-08 | 엘지전자 주식회사 | Method of Data Transmission in Communication System Using Multiple Antenna |
KR20110111855A (en) * | 2010-04-05 | 2011-10-12 | 주식회사 팬택 | Channel information feedback apparatus, method thereof and cell apparatus using the same |
JP5609991B2 (en) * | 2011-01-14 | 2014-10-22 | 富士通株式会社 | Mobile communication system, base station apparatus and communication control method |
EP2717508B1 (en) * | 2012-10-05 | 2014-11-05 | Fujitsu Limited | MIMO wireless communication system |
CN105763301B (en) * | 2014-12-19 | 2019-09-17 | 电信科学技术研究院 | Method and apparatus is determined based on the encoder matrix of multi-user coding superposition |
TWI648997B (en) * | 2017-03-15 | 2019-01-21 | 國立清華大學 | Joint power allocation, precoding, and decoding method and base station thereof |
CN108632896B (en) | 2017-03-15 | 2020-09-29 | 华为技术有限公司 | Data transmission method and related equipment |
CN109088664B (en) * | 2018-09-06 | 2021-02-02 | 西安电子科技大学 | Self-interference suppression method based on block diagonalization and triangular decomposition |
CN111371478B (en) * | 2018-12-26 | 2021-10-15 | 华为技术有限公司 | Precoding method and device and information transmission method and device |
CN115378545A (en) * | 2021-05-21 | 2022-11-22 | 华为技术有限公司 | Transmission system and transmission method |
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US7817745B2 (en) * | 2005-06-02 | 2010-10-19 | Adaptive Spectrum And Signal Alignment, Inc. | Tonal precoding |
TWI274482B (en) * | 2005-10-18 | 2007-02-21 | Ind Tech Res Inst | MIMO-OFDM system and pre-coding and feedback method therein |
CN100525275C (en) * | 2005-10-27 | 2009-08-05 | 财团法人工业技术研究院 | MIMO OFDM system and precoding and feedback method of it |
US20070133691A1 (en) * | 2005-11-29 | 2007-06-14 | Docomo Communications Laboratories Usa, Inc. | Method and apparatus for layered rateless coding |
KR20080022033A (en) * | 2006-09-05 | 2008-03-10 | 엘지전자 주식회사 | Method for feed back information concerning pre-coding and method for pre-coding |
US7486208B2 (en) * | 2007-05-16 | 2009-02-03 | International Business Machines Corporation | High-rate RLL encoding |
CN101370241B (en) | 2007-08-19 | 2015-01-14 | 上海贝尔股份有限公司 | Method and device for eliminating interference between received signal of multiple mobile stations |
CN101394254B (en) | 2007-09-20 | 2011-04-20 | 鼎桥通信技术有限公司 | Linear pre-coding method in multi-user MIMO system |
US8229017B1 (en) * | 2007-12-13 | 2012-07-24 | Marvell International Ltd. | Transmit beamforming utilizing channel estimation matrix decomposition feedback in a wireless MIMO communication system |
KR100932272B1 (en) | 2007-12-13 | 2009-12-16 | 한국전자통신연구원 | Transmission Interference Rejection Method for Multi-User Look |
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DESHENG WANG ET AL: "A novel coordinated multi-point Joint Processing algorithm", MICROELECTRONICS&ELECTRONICS, 2009. PRIMEASIA 2009. ASIA PACIFIC CONFERENCE ON POSTGRADUATE RESEARCH IN, IEEE, PISCATAWAY, NJ, USA, 19 January 2009 (2009-01-19), pages 65-68, XP031617972, ISBN: 978-1-4244-4668-1 * |
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BR112012003596A2 (en) | 2016-03-15 |
KR20120048017A (en) | 2012-05-14 |
JP2013502758A (en) | 2013-01-24 |
EP2469724B1 (en) | 2014-05-14 |
JP5450819B2 (en) | 2014-03-26 |
EP2469724A4 (en) | 2013-01-16 |
KR101334053B1 (en) | 2013-11-29 |
CN102474314A (en) | 2012-05-23 |
CN102474314B (en) | 2013-12-25 |
US8964869B2 (en) | 2015-02-24 |
WO2011020238A1 (en) | 2011-02-24 |
US20120170675A1 (en) | 2012-07-05 |
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